Support for metallic glow-filaments for electric incandescent lamps.



' tory oxids.

UnITED STATES PATENT OFFICE.

g ANTON LEDERER, OF ATZGEBSDORF, NEAR VIENNA, AUSTRIA-HUNGARY.

Y k SUPPORT.FQR METALLIC GLOW-FILAMENTS FOR ELECTRIC INGANDESCENT LAMPS.

No Drawing.

To all whom it may concern; v

Be 'itknown that I, ANTON LEoERER, a subject of the Empire ofAustria-Hungary, residing at No. 83' 'Atzgersdorf, near Vienna, in theProvince of Lower Austria and Empire of Austria-Hungary, have invented.certa'innew and useful Improvements in Supports for Metallic-GlowFilaments for -Electric Incandescent Lamps, of which the following is aspecification. This invention relates to improvements in supports formetallic glow filaments for electric incandescence lamps.

Su'pports of refractory. oxids as used with lamps having glow filamentsof osmium are not suitable for incandescence lamps having metallic glowfilaments other than of osmium. For example, glow filaments of tungstenwhich burn with an economy of 1' watt per Hefner candle cannot besupported by means of hooks orjeyes made of refrac- It seems that at thepoints of contact of the lowing filament with the support thereta esplace oxidation of the metal and respectively reduction of the supportin consequence of'which processes the y filaments are untimely destroyedat these oints.

If electric incandescence lamps havingglow filaments of tungsten thesupports of which are made of ids,-'"-are"suppl1edwith alternatingcurrent, the phenomena above mentioned occur more rarely in'consequencecontinuous current whereby of the vibrations'of he filament. However ifsuch a lamp is pl ced'in the circuit of a I thefilament will notvibrate, it will' be foimd, thatv the filament after a short time 12 to48 hours) e point of contact with the support.

The purpese of the present invention-is to rovide supports mainlyconsisting of re actor'y OXldS such, for example, as the oxids' of therare earths, of magnesium,

aluminium 'orofi mixtures of these.oxids-- also with electric'-incandescence lamps, they of, which are of tungsten or glow filamentsother metals.' 1

For abetter understanding of this inven--' tion, I will describetheprocesses already known according to which supports, for

,osmium filaments are manufactured, viz: There is prepared anintimatemixture of about 10jparts by weight of purethpriuni 02nd andabout lpart by weight of "magnesia. These oxids, m a finely divided orpow sugar.

. gen;

7 Specification of Letters Patent. Patented Decal? 1912; Applicationfiled August 25, 1906. Serial No. 382,078.

dered condition, are well ground to a paste by the addition of an'organic viscous binding material, as, for instance, a solution of Thepaste thus produced is then shaped into flexible filaments, of suitablelength, and one end of the filament is' bent,

or fashioned into the form of a small loop, a

hook, or spiral, designed subsequently to engage the osmium filament atthe required point of support. The paste filaments 'are then dried, andsubsequently burned in free I air until all the organic substance is"consumed. Fina1ly,-they'are subjected to the action ofv a very high temeratureuntil the particles are sintered or utted together.

-In order to make supports manufactured as above described,suitable forelectric lamps having metallic filaments other than osmium I metallize'such supports in the manner hereafter described -:The supports areimpregnated With solutions of metallic compounds that :may reduced tometal,

if necessary in name, in order to remove'the gases containedin thesupports and to permit of a-more uniform distribution of the liquid inthe support. Then the hooks, loops or similarly shaped supports afterhaving been dried (eventually only in free air) are heatedin reducinggases. For example, the

supports manufactured of thorium oxid are impregnated with solutions ofmeta-tungstic acid, colloidal 'tungstic acid, of the. am-\ moni umor.eventually amino-salts of tungsten,r-the thio-tungstates, then they aredried and heated in suitable vessels at-the required temperature in acurrent of hydro allowed to cool in the-reducing as. The so cooledsupports are all of .a right gray color and even under the microscopeno' places ofanoth'er color may be discovered. It is obvidus that thesupports may be subjected repeatedly to the process described, in orderto lncrease'the metalli'zing of the sup-.

cc of reducing The supports'thus heated are then 109 port of oxid,especially on the surface of By means of the described'process' suportsof oid may be metallized withnear y all difiicultl fusible metals.The so obtained met ized supports of oxid possess fracto oxidsispreferable. 1 $51 7 treatment but in general, the use of re t Y beunderstood that by first maka ing the strips of the refractory ,oxidswithappropriate binding material, drying and sinterlng them and thenimpregnatin themto such extent as they will receive t e metallicsolutions, a small antity of the metal 1 added but this, 0 course, isrelatively small. TI unaware that it has been proposed to constructconducting filaments for; incan-Q descent electric lamps of mixtures ofre-v fiactoryoxids and metals, but in such in- .The supports produced bythe herein described, not being intended stances it is desirable thatthe metal should largely predominate in order to render the filamentconductive.

ducting purposes, serve their function better than would any supporthaving a large portion of metal and furthermore they could not be usedas filaments.-

What I claim as m invention, and desire to secure by Letters atent-is 1.Supports v for metallic glow filaments of electric incandescentlampsconsisting of a prei'ponderance of refractory oxids impre natestantially as-described.

2. Supports for metallic glow filaments of electric incandescent lampsconsisting of a' preponderance of refractory I impregnation ofdifiicultly fusible metal disoxids and v an tributed thoroughly in themass of the oxids, substantiallyas described; i

Inwitness whereof I have hereunto set my hand in presence oftwowitnesses.

' I ANTQNLEDEREB. Witnes ses: i ALvnsm-S. Hootm, 'AUcUsr FUGGEB.

fprocess or conwith a diflicultly fusible metal, su

